PDF malware analysis — malicious · 050304189286ae65

MALICIOUS

PDF

70.5 KB Created: 2010-03-16 09:18:29 Authoring application: GZPGFrd (via ZNgM0JcAr)

MD5: dc533ac196d689392cf9a84168ac68e1 SHA-1: 720810c86d7cb3e22a6d55e728f978d7aafa9f59 SHA-256: 050304189286ae65da3f4820c3c06f961e7a3a15e64e141a22c1022de98cd32a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes `eval()` and `String.fromCharCode()` for obfuscation, a common technique for malicious scripts. The ML classifier and heuristic firings strongly indicate a malicious PDF exploit. The script is likely designed to download and execute a second-stage payload, although the exact URL or payload is obfuscated and truncated in the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `704a32f8b0a16a5b5b87c825e4b30e3e15443135bf3b9ee666a1e68d1969c28b`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23F	71005 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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